posix/bits/unistd.h

   1 /* Checking macros for unistd functions.
   2    Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _UNISTD_H
  21 # error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
  22 #endif
  23
  24 extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
  25                            size_t __buflen) __wur;
  26 extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
  27                                           size_t __nbytes), read) __wur;
  28 extern ssize_t __REDIRECT (__read_chk_warn,
  29                            (int __fd, void *__buf, size_t __nbytes,
  30                             size_t __buflen), __read_chk)
  31      __wur __warnattr ("read called with bigger length than size of "
  32                        "the destination buffer");
  33
  34 __extern_always_inline __wur ssize_t
  35 read (int __fd, void *__buf, size_t __nbytes)
  36 {
  37   if (__bos0 (__buf) != (size_t) -1)
  38     {
  39       if (!__builtin_constant_p (__nbytes))
  40         return __read_chk (__fd, __buf, __nbytes, __bos0 (__buf));
  41
  42       if (__nbytes > __bos0 (__buf))
  43         return __read_chk_warn (__fd, __buf, __nbytes, __bos0 (__buf));
  44     }
  45   return __read_alias (__fd, __buf, __nbytes);
  46 }
  47
  48 #ifdef __USE_UNIX98
  49 extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
  50                             __off_t __offset, size_t __bufsize) __wur;
  51 extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
  52                               __off64_t __offset, size_t __bufsize) __wur;
  53 extern ssize_t __REDIRECT (__pread_alias,
  54                            (int __fd, void *__buf, size_t __nbytes,
  55                             __off_t __offset), pread) __wur;
  56 extern ssize_t __REDIRECT (__pread64_alias,
  57                            (int __fd, void *__buf, size_t __nbytes,
  58                             __off64_t __offset), pread64) __wur;
  59 extern ssize_t __REDIRECT (__pread_chk_warn,
  60                            (int __fd, void *__buf, size_t __nbytes,
  61                             __off_t __offset, size_t __bufsize), __pread_chk)
  62      __wur __warnattr ("pread called with bigger length than size of "
  63                        "the destination buffer");
  64 extern ssize_t __REDIRECT (__pread64_chk_warn,
  65                            (int __fd, void *__buf, size_t __nbytes,
  66                             __off64_t __offset, size_t __bufsize),
  67                             __pread64_chk)
  68      __wur __warnattr ("pread64 called with bigger length than size of "
  69                        "the destination buffer");
  70
  71 # ifndef __USE_FILE_OFFSET64
  72 __extern_always_inline __wur ssize_t
  73 pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
  74 {
  75   if (__bos0 (__buf) != (size_t) -1)
  76     {
  77       if (!__builtin_constant_p (__nbytes))
  78         return __pread_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  79
  80       if ( __nbytes > __bos0 (__buf))
  81         return __pread_chk_warn (__fd, __buf, __nbytes, __offset,
  82                                  __bos0 (__buf));
  83     }
  84   return __pread_alias (__fd, __buf, __nbytes, __offset);
  85 }
  86 # else
  87 __extern_always_inline __wur ssize_t
  88 pread (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
  89 {
  90   if (__bos0 (__buf) != (size_t) -1)
  91     {
  92       if (!__builtin_constant_p (__nbytes))
  93         return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  94
  95       if ( __nbytes > __bos0 (__buf))
  96         return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
  97                                    __bos0 (__buf));
  98     }
  99
 100   return __pread64_alias (__fd, __buf, __nbytes, __offset);
 101 }
 102 # endif
 103
 104 # ifdef __USE_LARGEFILE64
 105 __extern_always_inline __wur ssize_t
 106 pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
 107 {
 108   if (__bos0 (__buf) != (size_t) -1)
 109     {
 110       if (!__builtin_constant_p (__nbytes))
 111         return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
 112
 113       if ( __nbytes > __bos0 (__buf))
 114         return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
 115                                    __bos0 (__buf));
 116     }
 117
 118   return __pread64_alias (__fd, __buf, __nbytes, __offset);
 119 }
 120 # endif
 121 #endif
 122
 123 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 124 extern ssize_t __readlink_chk (__const char *__restrict __path,
 125                                char *__restrict __buf, size_t __len,
 126                                size_t __buflen)
 127      __THROW __nonnull ((1, 2)) __wur;
 128 extern ssize_t __REDIRECT_NTH (__readlink_alias,
 129                                (__const char *__restrict __path,
 130                                 char *__restrict __buf, size_t __len), readlink)
 131      __nonnull ((1, 2)) __wur;
 132 extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
 133                                (__const char *__restrict __path,
 134                                 char *__restrict __buf, size_t __len,
 135                                 size_t __buflen), __readlink_chk)
 136      __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
 137                                           "than size of destination buffer");
 138
 139 __extern_always_inline __nonnull ((1, 2)) __wur ssize_t
 140 __NTH (readlink (__const char *__restrict __path, char *__restrict __buf,
 141                  size_t __len))
 142 {
 143   if (__bos (__buf) != (size_t) -1)
 144     {
 145       if (!__builtin_constant_p (__len))
 146         return __readlink_chk (__path, __buf, __len, __bos (__buf));
 147
 148       if ( __len > __bos (__buf))
 149         return __readlink_chk_warn (__path, __buf, __len, __bos (__buf));
 150     }
 151   return __readlink_alias (__path, __buf, __len);
 152 }
 153 #endif
 154
 155 #ifdef __USE_ATFILE
 156 extern ssize_t __readlinkat_chk (int __fd, __const char *__restrict __path,
 157                                  char *__restrict __buf, size_t __len,
 158                                  size_t __buflen)
 159      __THROW __nonnull ((2, 3)) __wur;
 160 extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
 161                                (int __fd, __const char *__restrict __path,
 162                                 char *__restrict __buf, size_t __len),
 163                                readlinkat)
 164      __nonnull ((2, 3)) __wur;
 165 extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
 166                                (int __fd, __const char *__restrict __path,
 167                                 char *__restrict __buf, size_t __len,
 168                                 size_t __buflen), __readlinkat_chk)
 169      __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
 170                                           "length than size of destination "
 171                                           "buffer");
 172
 173 __extern_always_inline __nonnull ((2, 3)) __wur ssize_t
 174 __NTH (readlinkat (int __fd, __const char *__restrict __path,
 175                    char *__restrict __buf, size_t __len))
 176 {
 177   if (__bos (__buf) != (size_t) -1)
 178     {
 179       if (!__builtin_constant_p (__len))
 180         return __readlinkat_chk (__fd, __path, __buf, __len, __bos (__buf));
 181
 182       if (__len > __bos (__buf))
 183         return __readlinkat_chk_warn (__fd, __path, __buf, __len,
 184                                       __bos (__buf));
 185     }
 186   return __readlinkat_alias (__fd, __path, __buf, __len);
 187 }
 188 #endif
 189
 190 extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
 191      __THROW __wur;
 192 extern char *__REDIRECT_NTH (__getcwd_alias,
 193                              (char *__buf, size_t __size), getcwd) __wur;
 194 extern char *__REDIRECT_NTH (__getcwd_chk_warn,
 195                              (char *__buf, size_t __size, size_t __buflen),
 196                              __getcwd_chk)
 197      __wur __warnattr ("getcwd caller with bigger length than size of "
 198                        "destination buffer");
 199
 200 __extern_always_inline __wur char *
 201 __NTH (getcwd (char *__buf, size_t __size))
 202 {
 203   if (__bos (__buf) != (size_t) -1)
 204     {
 205       if (!__builtin_constant_p (__size))
 206         return __getcwd_chk (__buf, __size, __bos (__buf));
 207
 208       if (__size > __bos (__buf))
 209         return __getcwd_chk_warn (__buf, __size, __bos (__buf));
 210     }
 211   return __getcwd_alias (__buf, __size);
 212 }
 213
 214 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 215 extern char *__getwd_chk (char *__buf, size_t buflen)
 216      __THROW __nonnull ((1)) __wur;
 217 extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
 218      __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
 219                                        "doesn't specify buffer size");
 220
 221 __extern_always_inline __nonnull ((1)) __attribute_deprecated__ __wur char *
 222 __NTH (getwd (char *__buf))
 223 {
 224   if (__bos (__buf) != (size_t) -1)
 225     return __getwd_chk (__buf, __bos (__buf));
 226   return __getwd_warn (__buf);
 227 }
 228 #endif
 229
 230 extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
 231                              size_t __buflen) __THROW;
 232 extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
 233                                                 size_t __len), confstr);
 234 extern size_t __REDIRECT_NTH (__confstr_chk_warn,
 235                               (int __name, char *__buf, size_t __len,
 236                                size_t __buflen), __confstr_chk)
 237      __warnattr ("confstr called with bigger length than size of destination "
 238                  "buffer");
 239
 240 __extern_always_inline size_t
 241 __NTH (confstr (int __name, char *__buf, size_t __len))
 242 {
 243   if (__bos (__buf) != (size_t) -1)
 244     {
 245       if (!__builtin_constant_p (__len))
 246         return __confstr_chk (__name, __buf, __len, __bos (__buf));
 247
 248       if (__bos (__buf) < __len)
 249         return __confstr_chk_warn (__name, __buf, __len, __bos (__buf));
 250     }
 251   return __confstr_alias (__name, __buf, __len);
 252 }
 253
 254
 255 extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
 256      __THROW __wur;
 257 extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
 258                            getgroups) __wur;
 259 extern int __REDIRECT_NTH (__getgroups_chk_warn,
 260                            (int __size, __gid_t __list[], size_t __listlen),
 261                            __getgroups_chk)
 262      __wur __warnattr ("getgroups called with bigger group count than what "
 263                        "can fit into destination buffer");
 264
 265 __extern_always_inline int
 266 __NTH (getgroups (int __size, __gid_t __list[]))
 267 {
 268   if (__bos (__list) != (size_t) -1)
 269     {
 270       if (!__builtin_constant_p (__size) || __size < 0)
 271         return __getgroups_chk (__size, __list, __bos (__list));
 272
 273       if (__size * sizeof (__gid_t) > __bos (__list))
 274         return __getgroups_chk_warn (__size, __list, __bos (__list));
 275     }
 276   return __getgroups_alias (__size, __list);
 277 }
 278
 279
 280 extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
 281                             size_t __nreal) __THROW __nonnull ((2));
 282 extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
 283                                                size_t __buflen), ttyname_r)
 284      __nonnull ((2));
 285 extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
 286                            (int __fd, char *__buf, size_t __buflen,
 287                             size_t __nreal), __ttyname_r_chk)
 288      __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
 289                                  "size of destination buffer");
 290
 291 __extern_always_inline int
 292 __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
 293 {
 294   if (__bos (__buf) != (size_t) -1)
 295     {
 296       if (!__builtin_constant_p (__buflen))
 297         return __ttyname_r_chk (__fd, __buf, __buflen, __bos (__buf));
 298
 299       if (__buflen > __bos (__buf))
 300         return __ttyname_r_chk_warn (__fd, __buf, __buflen, __bos (__buf));
 301     }
 302   return __ttyname_r_alias (__fd, __buf, __buflen);
 303 }
 304
 305
 306 #if defined __USE_REENTRANT || defined __USE_POSIX199506
 307 extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
 308      __nonnull ((1));
 309 extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
 310                        getlogin_r) __nonnull ((1));
 311 extern int __REDIRECT (__getlogin_r_chk_warn,
 312                        (char *__buf, size_t __buflen, size_t __nreal),
 313                        __getlogin_r_chk)
 314      __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
 315                                  "size of destination buffer");
 316
 317 __extern_always_inline int
 318 getlogin_r (char *__buf, size_t __buflen)
 319 {
 320   if (__bos (__buf) != (size_t) -1)
 321     {
 322       if (!__builtin_constant_p (__buflen))
 323         return __getlogin_r_chk (__buf, __buflen, __bos (__buf));
 324
 325       if (__buflen > __bos (__buf))
 326         return __getlogin_r_chk_warn (__buf, __buflen, __bos (__buf));
 327     }
 328   return __getlogin_r_alias (__buf, __buflen);
 329 }
 330 #endif
 331
 332
 333 #if defined __USE_BSD || defined __USE_UNIX98
 334 extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
 335      __THROW __nonnull ((1));
 336 extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
 337                            gethostname) __nonnull ((1));
 338 extern int __REDIRECT_NTH (__gethostname_chk_warn,
 339                            (char *__buf, size_t __buflen, size_t __nreal),
 340                            __gethostname_chk)
 341      __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
 342                                  "size of destination buffer");
 343
 344 __extern_always_inline int
 345 __NTH (gethostname (char *__buf, size_t __buflen))
 346 {
 347   if (__bos (__buf) != (size_t) -1)
 348     {
 349       if (!__builtin_constant_p (__buflen))
 350         return __gethostname_chk (__buf, __buflen, __bos (__buf));
 351
 352       if (__buflen > __bos (__buf))
 353         return __gethostname_chk_warn (__buf, __buflen, __bos (__buf));
 354     }
 355   return __gethostname_alias (__buf, __buflen);
 356 }
 357 #endif
 358
 359
 360 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
 361 extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
 362      __THROW __nonnull ((1)) __wur;
 363 extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
 364                                                    size_t __buflen),
 365                            getdomainname) __nonnull ((1)) __wur;
 366 extern int __REDIRECT_NTH (__getdomainname_chk_warn,
 367                            (char *__buf, size_t __buflen, size_t __nreal),
 368                            __getdomainname_chk)
 369      __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
 370                                        "buflen than size of destination "
 371                                        "buffer");
 372
 373 __extern_always_inline int
 374 __NTH (getdomainname (char *__buf, size_t __buflen))
 375 {
 376   if (__bos (__buf) != (size_t) -1)
 377     {
 378       if (!__builtin_constant_p (__buflen))
 379         return __getdomainname_chk (__buf, __buflen, __bos (__buf));
 380
 381       if (__buflen > __bos (__buf))
 382         return __getdomainname_chk_warn (__buf, __buflen, __bos (__buf));
 383     }
 384   return __getdomainname_alias (__buf, __buflen);
 385 }
 386 #endif